Search for Radiochemical Evidence for Ternary Fission ofU235by Thermal Neutrons

Upper limits for yields of certain isotopes of argon from fission of

{}^{235}U

by thermal neutrons were determined radiochemically as follows:

{}^{37}{Ar}

, ≤1×

10^{- 7}

{}^{39}{Ar}

, ≤4×

10^{- 7}

{}^{41}{Ar}

, ≤3×

10^{- 9}

{}^{42}{Ar}

, ≤3×

10^{- 11}

%. The upper limit for the fission yield of

{}^{56}{Co}

(daughter of

{}^{56}{Ni}

) was determined as ≤8×

10^{- 8}

%. The yields of these isotopes are three to seven orders of magnitude lower than those expected from thermal-neutron-induced ternary fission of

{}^{235}U

as described by Muga.

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